Auxiliary heat transfer attachment unit for an existing fireplace



FIG. 1 is a rear perspective view of an auxiliary heat transfer attachment unit for an existing fireplace showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an auxiliary heat transfer attachment unit for an existing fireplace, substantially as shown. 